<?php
    // +----------------------------------------------------------------------
    // | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
    // +----------------------------------------------------------------------
    // | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
    // +----------------------------------------------------------------------
    // | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
    // +----------------------------------------------------------------------
    // | Author: liu21st <liu21st@gmail.com>
    // +----------------------------------------------------------------------
    namespace think\db\builder;

    use think\db\Builder;

    /**
     * Sqlsrv数据库驱动
     */
    class Sqlsrv extends Builder {
        protected $selectSql       = 'SELECT T1.* FROM (SELECT thinkphp.*, ROW_NUMBER() OVER (%ORDER%) AS ROW_NUMBER FROM (SELECT %DISTINCT% %FIELD% FROM %TABLE%%JOIN%%WHERE%%GROUP%%HAVING%) AS thinkphp) AS T1 %LIMIT%%COMMENT%';
        protected $selectInsertSql = 'SELECT %DISTINCT% %FIELD% FROM %TABLE%%JOIN%%WHERE%%GROUP%%HAVING%';
        protected $updateSql       = 'UPDATE %TABLE% SET %SET% FROM %TABLE% %JOIN% %WHERE% %LIMIT% %LOCK%%COMMENT%';
        protected $deleteSql       = 'DELETE FROM %TABLE%  %USING% FROM %TABLE%  %JOIN% %WHERE% %LIMIT% %LOCK%%COMMENT%';

        public function selectInsert($fields, $table, $options) {
            $this->selectSql = $this->selectInsertSql;
            return parent::selectInsert($fields, $table, $options);
        }

        /**
         * order分析
         * @access protected
         * @param mixed $order
         * @param array $options
         * @return string
         */
        protected function parseOrder($order, $options = []) {
            if (is_array($order)) {
                $array = [];
                foreach ($order as $key => $val) {
                    if (is_numeric($key)) {
                        if (false === strpos($val, '(')) {
                            $array[] = $this->parseKey($val, $options);
                        } elseif ('[rand]' == $val) {
                            $array[] = $this->parseRand();
                        }
                    } else {
                        $sort    = in_array(strtolower(trim($val)), [
                                                                      'asc',
                                                                      'desc'
                                                                  ]
                        ) ? ' ' . $val : '';
                        $array[] = $this->parseKey($key, $options) . ' ' . $sort;
                    }
                }
                $order = implode(',', $array);
            }
            return !empty($order) ? ' ORDER BY ' . $order : ' ORDER BY rand()';
        }

        /**
         * 字段和表名处理
         * @access protected
         * @param string $key
         * @param array  $options
         * @return string
         */
        protected function parseKey($key, $options = []) {
            $key = trim($key);
            if (strpos($key, '.') && !preg_match('/[,\'\"\(\)\[\s]/', $key)) {
                list($table, $key) = explode('.', $key, 2);
                if ('__TABLE__' == $table) {
                    $table = $this->query->getTable();
                }
                if (isset($options['alias'][$table])) {
                    $table = $options['alias'][$table];
                }
            }
            if (!is_numeric($key) && !preg_match('/[,\'\"\*\(\)\[.\s]/', $key)) {
                $key = '[' . $key . ']';
            }
            if (isset($table)) {
                $key = '[' . $table . '].' . $key;
            }
            return $key;
        }

        /**
         * 随机排序
         * @access protected
         * @return string
         */
        protected function parseRand() {
            return 'rand()';
        }

        /**
         * limit
         * @access protected
         * @param mixed $limit
         * @return string
         */
        protected function parseLimit($limit) {
            if (empty($limit)) {
                return '';
            }
            $limit = explode(',', $limit);
            if (count($limit) > 1) {
                $limitStr = '(T1.ROW_NUMBER BETWEEN ' . $limit[0] . ' + 1 AND ' . $limit[0] . ' + ' . $limit[1] . ')';
            } else {
                $limitStr = '(T1.ROW_NUMBER BETWEEN 1 AND ' . $limit[0] . ")";
            }
            return 'WHERE ' . $limitStr;
        }
    }
